Electricity: power supply or regulation systems – For phase shift or control – By splitting and combining
Patent
1996-07-05
1998-04-07
Krishnan, Aditya
Electricity: power supply or regulation systems
For phase shift or control
By splitting and combining
G05F 170
Patent
active
057368392
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention generally relates to three-phase-conductor arrangements, and specifically to methods end arrangements using phase splitting and configuration of phase conductors for the primary purpose of obtaining a reduction of the magnetic field generated by a three-phase-conductor arrangement.
TECHNICAL BACKGROUND
Today it is common knowledge that it is desirable to reduce the magnetic field in the vicinity of three-phase-conductor arrangements, both in consideration of any effects on the health and in consideration of disturbing effects on electronic equipment. Typical three-phase-conductor arrangements are in this context, for example, overhead and underground power lines, bus bar systems in substation switch gears and generator bus bars in power plants and the like.
Regarding overhead lines, attempts have been made to reduce the generated magnetic field by different kinds of symmetrical phase conductor arrangements comprising split phases having five or six phase conductors, implying that two and, respectively, three phases have been split into two phase conductors each. This results in costly and extensive arrangements.
Particular problems arise in connection with existing three-phase-conductor arrangements having three phase conductors, which in many cases cannot be rebuilt in a reasonable manner for reducing the generated magnetic field.
OBJECTS OF THE INVENTION
The main object of the present invention is to provide a method for reducing in a simple, inexpensive and effective manner the magnetic field from a three-phase-conductor arrangement.
Another object of the present invention is to provide a method for magnetic field reduction, which does not require extensive symmetrical phase conductor configurations.
A further object of the present invention is to provide a method for magnetic field reduction, which is very well adapted for use in existing three-phase arrangements having three phase conductors in planar configuration.
One more object of the invention is to provide a method which renders it possible, in addition to magnetic field reduction, to also alternatively easily use phase conductors in various conventional arrangements having three phase conductors.
One more object of the invention is to provide a method which makes it possible, in a three-phase arrangement for transmission over long distances, to simultaneously increase the transmission capacity and reduce the generated magnetic field as compared with a conventional arrangement having three phase conductors.
SUMMARY OF THE INVENTION
The above-mentioned objects are achieved by a method, an arrangement and a use having the features stated in the accompanying claims.
The invention thus is based on the knowledge that an unsymmetrical arrangement of four phase conductors, of which two are connected to one and the same phase and form a loop, surprisingly yields an essential magnetic field reduction as compared with a conventional arrangement of three phase conductors. The two "split" phase conductors are arranged each on one side of and outside the two phase conductors in the middle, which belong to the non-split phases. The loop is formed by connecting the two outer phase conductors with each other at least at the beginning and, respectively, at the end of the phase splitting. Connections can be carried out in a conventional manner. In overhead lines, they may consist of, for example, suspension cross-connecting conductors (slacks) in connection with suspension from used pole constructions. In bus bars, they consist naturally of the connecting bars of each cell, extending to the two split phase conductors.
In the inventive arrangement, the four phase conductors, seen transversely of the extent of the phase conductors, are thus arranged in an extended configuration, preferably at least essentially planar or straight. The phase conductors are advantageously equidistantly spaced, the space between them being kept as small as possible, while considering the necessary requirements for insulation etc. The phas
REFERENCES:
patent: 5121048 (1992-06-01), Larsen
Krishnan Aditya
Vattenfall AB
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